[github/actions] Remove cppcheck (useless for this package)

Remove ament_copyright, LICENSE should be specified only inside the
repository or the package.

.github/workflows/ci-ros-lint.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-          linter: [copyright, cppcheck, lint_cmake]
+          linter: [lint_cmake]
     steps:
     - uses: actions/checkout@v1
     - uses: ros-tooling/[email protected]